DE3004507A1 - Free wheeling three=phase inverter with variable supply - has antiparallel network of thyristor and diode isolating inverter from source - Google Patents
Free wheeling three=phase inverter with variable supply - has antiparallel network of thyristor and diode isolating inverter from sourceInfo
- Publication number
- DE3004507A1 DE3004507A1 DE19803004507 DE3004507A DE3004507A1 DE 3004507 A1 DE3004507 A1 DE 3004507A1 DE 19803004507 DE19803004507 DE 19803004507 DE 3004507 A DE3004507 A DE 3004507A DE 3004507 A1 DE3004507 A1 DE 3004507A1
- Authority
- DE
- Germany
- Prior art keywords
- inverter
- thyristor
- decoupling
- network
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/5152—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with separate extinguishing means
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
Beschreibung description
Die Erfindung bezeiht sich auf einen selbstgeführten Drehstrom-Wechselrichter gemäß dem Oberbegriff des Patentanspruchs 1. Ein derartiger Wechselrichter ist aus der DE-PS 20 12 893 bekannt.The invention relates to a self-commutated three-phase inverter according to the preamble of claim 1. Such an inverter is off the DE-PS 20 12 893 known.
Ein derartiger Wechselrichter hat die Eigenschaft, im Leerlauf den Stützkondensator aufzuladen. Man kann folglich ohne eine gewisse Mindestlast die für Motoren erforderliche Spannungs-Frequenz-Kennlinie nicht einstellen. Das liegt daran, daß die währenc des Kommutierungsvorgangs in den Querdrosseln gespeicherte Energie über die Freilaufdioden in den Stützkondensator des Gleichspannungskreises zurückgespeist wird, solange die Spannung dort niedriger ist als an den Querdrosseln. Damit wird der Stützkondensator auf nahezu Nennspannung aufgeladen.Such an inverter has the property of when idling Charging backup capacitor. You can therefore without a certain minimum load the Do not set the voltage-frequency characteristic required for motors. It lies the fact that the during the commutation process stored in the transverse chokes Energy via the freewheeling diodes in the backup capacitor of the DC voltage circuit is fed back as long as the voltage there is lower than at the shunt reactors. This charges the backup capacitor to almost the nominal voltage.
Naheliegend ist es, am Wechselrichterausgang eine Widerstands-Drossel-Kombination als Grundlast zur Aufnahme der Magnetisierungsenergie der Querdrosseln anzuschließen. In dieser Kombination wird dann allerdings diese Energie vornehmlich in Wärme umgesetzt, so daß sich der Wirkungsgrad des Wechselrichters verschlechtert.It is obvious to use a resistor-choke combination at the inverter output to be connected as a base load to absorb the magnetization energy of the shunt chokes. In this combination, however, this energy is primarily converted into heat, so that the efficiency of the inverter deteriorates.
Der Erfindung liegt die Aufgabe zugrunde, mit einfachen Mitteln den Gleichspannungskreis mit variabler Spannung vcm selbstgeführten Wechselrichter derart zu enlkoppeln, daß eine Fremdaufladung des Stützkondensators verhindert wird.The invention is based on the object with simple means DC voltage circuit with variable voltage vcm self-commutated inverter such to enlkoppeleln that an external charging of the backup capacitor is prevented.
Diese Aufgabe wird gemäß der Erfindung bei einem Drehstrom-Wechselrichter der eingangs angegebenen Art durch die im Patentanspruchlgekennzeichneten Merkmale gelöst.According to the invention, this object is achieved in a three-phase inverter of the type specified at the beginning by the features characterized in patent claims solved.
Auf diese Weise wird sichergestellt, daß nur zu definierten Zeiten eine elektrische Verbindung in Rückwartsrichtung durch Zündung des Entkopplungs-Thyristors zwischen dem selbstgeführten Wechselrichter und dem Stützkondensator hergestellt wird. Aufgrund der Entkopplung wird der Stützkondensator nur noch von der Gleichspannungsquelle her eingespeist, so daE, mit Hilfe eines Reglers die gewanschte Spannungs-Frequenz-Kennlinie eingestellt werden kann. Die Erfindung soll für ein Ausführungsbeispiel anhand der Zeichnungsfigur im folgenden erläutert werden: In der Zeichnungsfigu- ist ein dreiphasiger Wechselrichter gezeigt, der aus einer Gleichspannungsquelle 18 variabler Spannung gespeist wird. Die Gleichspannungsquelle 18 kann z.B. auch ein Netzstromrichter eines Umrichters mit Gleichspannungszwischenkreis sein. Parallel zur Gleichspannungs quelle 18 ist ein Stützkondensator 17 angeordnet.In this way it is ensured that only at defined times an electrical connection in the reverse direction by triggering the decoupling thyristor established between the self-commutated inverter and the backup capacitor will. Due to the decoupling, the backup capacitor is only connected to the DC voltage source fed in, so that, with the help of a controller, the applied voltage-frequency characteristic can be adjusted. The invention is intended for an embodiment based on the Drawing figure will be explained in the following: In the drawing figure is a three-phase Inverter shown, which consists of a DC voltage source 18 of variable voltage is fed. The DC voltage source 18 can, for example, also be a line power converter of a converter with a DC voltage intermediate circuit be. Parallel A backup capacitor 17 is arranged for the DC voltage source 18.
Der Wechselrichter weist je Phase zwei Thyristoren und zwei Freilaufdioden in Brückenschaltung auf, In deren Querzweig ist jeweils eine Kommutierungsdrossel 20, 21, 22 (Querdrossel) vorgesehen. Die Querdrosseln 20, 21, 22 weisen jeweils eine Mittelanzapfung auf, an die die Phasen R, S, T einer vom Wechselrichter speisbaren Drehstromlast anschließbar ist.The inverter has two thyristors and two free-wheeling diodes per phase in bridge circuit, in each of the shunt branches there is a commutation reactor 20, 21, 22 (transverse throttle) are provided. The cross chokes 20, 21, 22 each have a center tap to which the phases R, S, T can be fed by the inverter Three-phase load can be connected.
In der Zeichnungsfigur sind lediglich die zwei Thyristoren 11, 12 und die zwei Rücklaufdioden 13, 1 der Phase R näher bezeichnet. Die Kommutierung zwischen den einzelnen Phasen wird mittels einer nicht näher gezeigten Komrutierungseinheit 19 über die Kommutierungsthyristoren 10 vorgenommen.Only the two thyristors 11, 12 are shown in the drawing and the two return diodes 13, 1 of phase R designated in more detail. The commutation between the individual phases is carried out by means of a communication unit (not shown in detail) 19 made via the commutation thyristors 10.
Zwischen dem einen Anschluß des Stützkondensators 17 und dem Wechselrichter ist eine Kombination eines Entkopplungs-Tr.yristors 16 und einer ihm antiparallelgeschalteten Diode angeordnet. Dabei weist der Entkopplungs-Thyristor 16 in seiner positiven Durchlaßrichtung vom Wechselrichter zum Stützkondensator.Between one connection of the backup capacitor 17 and the inverter is a combination of a decoupling Tr.yristor 16 and one connected to it in anti-parallel Arranged diode. The decoupling thyristor 16 has in its positive Forward direction from the inverter to the backup capacitor.
Sofern die Kombination aus Thyristor 16 und Diode 15 nicht vorhanden ist, lädt die in den Querdrosseln während des Kommutierungsvorgangs gespeicherte Energie den Stützkondensator 17 undefiniert auf. Durch den Entkopplungs-Thyristor 16 wird dieses verhindert. Mit dem Thyristor 16 wird erst dann eine elektrische Verbindung zwischen dem Wechselrichter und dem Stützkondensator 17 hergestellt, wenn die Querdrosseln 20, 21, 22 sich entmagnetisiert haben, d.h. der Kommutierungsvorgang beendet ist.If the combination of thyristor 16 and diode 15 is not available is, loads the stored in the transverse chokes during the commutation process Energy the backup capacitor 17 undefined. Through the decoupling thyristor 16 this is prevented. With the thyristor 16 only then is an electrical Connection between the inverter and the backup capacitor 17 established, when the transverse chokes 20, 21, 22 have demagnetized, i.e. the commutation process is finished.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803004507 DE3004507C2 (en) | 1980-02-05 | 1980-02-05 | Circuit arrangement for decoupling an inverter fed from a variable DC voltage circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803004507 DE3004507C2 (en) | 1980-02-05 | 1980-02-05 | Circuit arrangement for decoupling an inverter fed from a variable DC voltage circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3004507A1 true DE3004507A1 (en) | 1981-08-13 |
DE3004507C2 DE3004507C2 (en) | 1986-07-24 |
Family
ID=6093991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19803004507 Expired DE3004507C2 (en) | 1980-02-05 | 1980-02-05 | Circuit arrangement for decoupling an inverter fed from a variable DC voltage circuit |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3004507C2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3005527A1 (en) * | 1980-02-12 | 1981-08-20 | Licentia Gmbh | Inverter with antiparallel diode and coupling thyristor - has current transformers receiving recovery current connected to gating system for coupling thyristor |
DE3150921A1 (en) * | 1981-12-18 | 1983-06-30 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Arrangement for the regenerative braking of railway power units |
-
1980
- 1980-02-05 DE DE19803004507 patent/DE3004507C2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3005527A1 (en) * | 1980-02-12 | 1981-08-20 | Licentia Gmbh | Inverter with antiparallel diode and coupling thyristor - has current transformers receiving recovery current connected to gating system for coupling thyristor |
DE3150921A1 (en) * | 1981-12-18 | 1983-06-30 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Arrangement for the regenerative braking of railway power units |
Also Published As
Publication number | Publication date |
---|---|
DE3004507C2 (en) | 1986-07-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8125 | Change of the main classification |
Ipc: H02M 7/515 |
|
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8320 | Willingness to grant licences declared (paragraph 23) | ||
8339 | Ceased/non-payment of the annual fee |